131306311 has 4 divisors (see below), whose sum is σ = 131370624. Its totient is φ = 131242000.

The previous prime is 131306309. The next prime is 131306323. The reversal of 131306311 is 113603131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131306311 - 2¹ = 131306309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131306381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28990 + ... + 33211.

It is an arithmetic number, because the mean of its divisors is an integer number (32842656).

Almost surely, 2^131306311 is an apocalyptic number.

131306311 is a deficient number, since it is larger than the sum of its proper divisors (64313).

131306311 is an equidigital number, since it uses as much as digits as its factorization.

131306311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64312.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 131306311 is about 11458.8965873683. The cubic root of 131306311 is about 508.2708464862.

Adding to 131306311 its reverse (113603131), we get a palindrome (244909442).

The spelling of 131306311 in words is "one hundred thirty-one million, three hundred six thousand, three hundred eleven".